Hmm. I don't have specific feelings about any of the guys, but if pressed, I'd say:
James. PMU was my intro to the band, and that song, and James's vocals specifically, were what made me go "damn I need to check these guys out!" He has the hardest job in the band, has endured the most struggles, and has been there all the way (since I&W anyway). He also gives insightful, fun interviews, and has released some quality non-DT material.
JP: For driving this shit musically since inception, and doing it admirably without controversy or drama the whole way.
I really want to say MP because between 1992 and 2011, along with James, he was. I didn't like his vocals and some of his musical preferences that were creeping in to DT's music, but the good he brought the group far outweighed that. I'm not a fan of much of his non-DT work, but I don't hold that against him. That's just my tastes. But the post-2011 drama and bs dropped him down a few notches in my eyes.
I don't have specific feelings on the other guys good or bad, other than appreciation for all the wonderful music. I am glad MM got the job not only for DT's sake but for his, as he seems truly overjoyed to be part of the band even now several years in to it.
I'll vote JLB and JP and abstain on the third vote.